EP2826966A1 - Générateur acoustique d'un système antibruit agissant sur les bruits de gaz d'échappement et/ou les bruits d'admission d'un véhicule automobile - Google Patents

Générateur acoustique d'un système antibruit agissant sur les bruits de gaz d'échappement et/ou les bruits d'admission d'un véhicule automobile Download PDF

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Publication number
EP2826966A1
EP2826966A1 EP14172712.3A EP14172712A EP2826966A1 EP 2826966 A1 EP2826966 A1 EP 2826966A1 EP 14172712 A EP14172712 A EP 14172712A EP 2826966 A1 EP2826966 A1 EP 2826966A1
Authority
EP
European Patent Office
Prior art keywords
diaphragm
membrane
stop
sound generator
permanent magnet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14172712.3A
Other languages
German (de)
English (en)
Other versions
EP2826966B1 (fr
Inventor
Maximilian Peitz
Steffen David
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eberspaecher Exhaust Technology GmbH and Co KG
Original Assignee
Eberspaecher Exhaust Technology GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of EP2826966A1 publication Critical patent/EP2826966A1/fr
Application granted granted Critical
Publication of EP2826966B1 publication Critical patent/EP2826966B1/fr
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Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/06—Silencing apparatus characterised by method of silencing by using interference effect
    • F01N1/065—Silencing apparatus characterised by method of silencing by using interference effect by using an active noise source, e.g. speakers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1244—Intake silencers ; Sound modulation, transmission or amplification using interference; Masking or reflecting sound
    • F02M35/125—Intake silencers ; Sound modulation, transmission or amplification using interference; Masking or reflecting sound by using active elements, e.g. speakers
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17879—General system configurations using both a reference signal and an error signal
    • G10K11/17883—General system configurations using both a reference signal and an error signal the reference signal being derived from a machine operating condition, e.g. engine RPM or vehicle speed
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3212—Actuator details, e.g. composition or microstructure

Definitions

  • the invention relates to a sound generator for an anti-sound system for influencing sound waves conducted in exhaust systems of vehicles powered by internal combustion engines (exhaust noise) and / or for influencing sound waves conducted in intake systems of internal combustion engines (intake noise).
  • noises are generated as a result of the successive operating cycles (in particular suction and compression of a fuel-air mixture, working and expelling the combusted fuel-air mixture). These go through as a structure-borne noise the internal combustion engine and are radiated outside the internal combustion engine as airborne sound. On the other hand, the noise as airborne sound, together with the combusted fuel-air mixture, pass through an exhaust system in fluid communication with the internal combustion engine.
  • the noise that passes through the internal combustion engine as structure-borne sound can be well insulated and therefore generally poses no problem with regard to noise protection.
  • the an exhaust system of the internal combustion engine together with the combusted fuel-air mixture as airborne noise passing through are arranged in front of the mouth of the exhaust system arranged muffler, which are possibly downstream of existing catalysts.
  • Such silencers can work, for example, according to the absorption and / or reflection principle. Both modes of operation have the disadvantage that they require a comparatively large volume and set a relatively high resistance to the burned fuel-air mixture, whereby the overall efficiency of the vehicle decreases and fuel consumption increases.
  • Such antisound systems typically use a so-called filtered-mean-time squares (FxLMS) algorithm which seeks to zero the airborne sound carried in the exhaust system by emitting sound via at least one speaker in fluid communication with the exhaust system (in the case of sound cancellation). or to control a predetermined threshold (in the case of sound interference).
  • FxLMS filtered-mean-time squares
  • the sound waves originating from the loudspeaker must correspond in amplitude and frequency to the sound waves carried in the exhaust system, however, relative to these, have a phase shift of 180 °.
  • the sound waves of the airborne sound carried in the exhaust system and the sound waves of the anti-sounding generated by the loudspeaker are in frequency, and they have a phase shift of 180 ° relative to one another, the sound waves do not correspond in amplitude but only to a weakening of the guided in the exhaust system sound waves of airborne sound.
  • the anti-noise is calculated separately by means of the FxLMS algorithm by determining a suitable frequency and phase of two mutually shifted by 90 ° sine waves, and the required amplitudes for these sine waves are calculated.
  • the aim of anti-sound systems is that the sound cancellation or sound influencing at least outside, but possibly also within the exhaust system is audible and measurable.
  • anti-noise is used in this document to distinguish the airborne sound carried in the exhaust system. By itself, Anti-Schall is ordinary airborne sound. It is emphasized that the present invention is not limited to the use of a FxLMS algorithm.
  • the intake system which is also referred to as intake, comprises all combustion air-carrying components of an internal combustion engine, which are located in front of the combustion chamber or the combustion chamber.
  • FIG. 1 shown in a schematic perspective view of the anti-sound system has a sound generator 3 in the form of a solid housing containing an electrodynamic speaker 2 and is connected via a Y-piece 1 to an exhaust system 4.
  • the Y-piece 1 has at the foot of the "Y" on an orifice 43 to emit exhaust gas guided in the exhaust system 4 to the outside.
  • the thermal load of the recorded in the sound generator 3 speaker 2 is kept low by the guided in the exhaust system 4 exhaust gas. This is necessary because conventional speakers can only work in a range of up to 200 ° C, the temperature of the exhaust gas guided in the exhaust system 4 but can be up to between 400 ° C and 700 ° C.
  • FIG. 2 schematically is a sectional view through the sound generator 3 using the example of a voice coil loudspeaker shown.
  • the loudspeaker 2 has a permanent magnet 21 and a funnel-shaped membrane 22, which are jointly carried by a loudspeaker basket 23.
  • the membrane 22 is radially outwardly connected via an elastic bead (not shown) to the loudspeaker frame 23 and has radially inside a voice coil (not shown), which is guided in bores in the permanent magnet 21.
  • the loudspeaker basket 23 is supported radially on the outside by a horn 42, which is connected to the Y-piece 1 via a connecting tube 41.
  • the use of the bell mouth 42 is required because the area of the diaphragm 22 of the loudspeaker 2 is greater than the cross-sectional area of the exhaust system 4 in the region of the coupling of the sound. This is necessary to achieve the required sound fluxes.
  • a control signal with which the loudspeaker is operated can also cause excessive deflection of the diaphragm, for example if the control signal is not adapted well enough to the loudspeaker used, or the control signal excites the loudspeaker with its natural resonance.
  • Embodiments of a sound generator for an anti-sound system for influencing sound waves guided in exhaust systems or intake systems of vehicles powered by internal combustion engines include a loudspeaker basket, a membrane supported on the loudspeaker basket, a permanent magnet supported on the loudspeaker basket, a voice coil carried by a voice coil former and a voice coil Membrane stop on.
  • the diaphragm stop provides a firm stop for the diaphragm.
  • the voice coil is disposed in a DC magnetic field generated by the permanent magnet and supported by the diaphragm.
  • the membrane stop has at least one projection which extends in the direction of the membrane and is at a distance therefrom in the rest position of the membrane.
  • the at least one projection of the membrane stop (in each case) has at least one stop surface facing the membrane.
  • the abutment surfaces of all projections of the membrane stop together in the sum of a membrane-facing surface, the more than 2 percent and less than 15 percent of the surface of the membrane and in particular more than 4 percent and less than 10 percent of the surface of the membrane and further in particular between 7 percent and 9 percent of the surface of the membrane.
  • the abutment surfaces of all projections of the membrane stop each have, starting from the permanent magnet on a greater extent in the radial direction than in the circumferential direction.
  • the abutment surfaces of all projections of the diaphragm stop in an axial plan view of the permanent magnet and extend the surrounding membrane stop in the radial direction.
  • the at least one projection of the membrane stop has a stop surface facing the membrane. Then, the abutment surface of the at least one projection of the membrane stop in the rest position of the membrane at a distance from the membrane, which is at the same time over the entire extent of the abutment surface of the respective projection substantially constant and the same size for all projections of the membrane stop. Deviations of less than 5 percent and in particular less than 3 percent and more particularly less than 1 percent are permissible. In this way, it is ensured that a force acting on the abutment surfaces in case of striking the membrane force is distributed as uniformly as possible on all abutment surfaces and over the entire surface of the at least one projection facing the membrane.
  • the distance of the membrane-facing abutment surface (s) of the at least one projection of the membrane stop in the rest position of the membrane is at least 3 mm and in particular at least 6 mm and more particularly at least 9 mm.
  • the distance of the membrane-facing abutment surface (s) of the at least one projection of the membrane stop in the rest position of the membrane is at least 2 percent and in particular at least 4 percent and more preferably at least 6 percent of a maximum diameter of the membrane. In this way, a striking of the membrane to the membrane stop during normal operation of the speaker is largely avoided.
  • the membrane stopper has a free one inner diameter which is larger than a largest diameter of the voice coil bobbin.
  • the at least one of the membrane facing abutment surface of the at least one projection of the membrane stop is arranged outside of the voice coil former usually covering dome. In this way, a collision of the voice coil bobbin with the diaphragm stop is avoided.
  • the diaphragm stopper has a largest outer diameter that is smaller than a largest diameter of the diaphragm.
  • the diaphragm stop has a plurality of spaced-apart projections, which are arranged distributed over an angular range of 360 ° around the permanent magnet.
  • This arrangement can be uniform or non-uniform.
  • the force is distributed to the plurality of protrusions, thereby avoiding both membrane damage and membrane tilting due to punctiform and / or unilateral loading.
  • obstruction of the air flowing between the membrane and the loudspeaker frame, and thus the acoustic properties of the sound generator is minimized by the resulting skeletal structure of the diaphragm stop.
  • the diaphragm stop has at least four and in particular at least sixteen and more particularly at least twenty-four projections, which are arranged distributed around the permanent magnet over an angular range of 360 °. This arrangement can be uniform or non-uniform. The larger the number of projections is selected, the smaller the at least one of the membrane facing stop surface of the individual projections can be formed. According to one embodiment, the at least one projection of the membrane stop on its stop surface facing the membrane no sharp edges and / or radii less than 0.1 mm and in particular less than 0.5 mm and more particularly less than 1 mm, to damage the membrane in the case to avoid a stop.
  • the diaphragm stop has a first ring which is fixed concentrically to the permanent magnet on the loudspeaker frame, and which carries the at least one projection. Via this first ring, a force acting on the at least one projection force can be uniformly discharged to the loudspeaker frame.
  • the diaphragm stopper has a second ring, which is arranged concentrically to the permanent magnet, is supported by the at least one projection of the diaphragm stop, and forms a spaced from the speaker basket stop surface for the membrane.
  • this second ring has a maximum cross section of less than 5 mm and in particular less than 3 mm.
  • the membrane stopper is formed integrally with the speaker basket. According to an alternative embodiment, the membrane stopper is a separate component held on the loudspeaker basket.
  • the diaphragm stop, the permanent magnet and the voice coil bobbins are all disposed on the same side of the diaphragm with respect to the diaphragm.
  • the membrane is not disposed between the diaphragm stop, the permanent magnet and the voice coil bobbin.
  • the membrane stopper is an integral part made of plastic or metal and in particular a casting and further in particular an injection molded part.
  • the membrane stop has a Shore D hardness of between 50 and 95 and in particular between 70 and 80. According to one embodiment, the membrane stop has a ball pressure hardness in the dry state according to DIN 53456 of between 130 MPa and 170 MPa.
  • the membrane stopper is inelastic and therefore rigid.
  • the membrane stop has a modulus of elasticity of more than 0.2 GPa and in particular of more than 1 GPa and more particularly of more than 10 GPa.
  • the membrane stop has a shear modulus of more than 0.05 GPa and in particular of more than 0.1 GPa and more particularly of more than 10 GPa.
  • the membrane is funnel-shaped and in particular non-developable funnel-shaped (NAWI membrane) or spherical cap-shaped, and the tip or top surface of the funnel-shaped membrane or the geometric center of the spherical cap facing the permanent magnet.
  • the base of the funnel-shaped or spherical cap membrane is thus remote from the permanent magnet.
  • the tip or top surface of the funnel-shaped membrane or the geometric center of the spherical cap-shaped membrane of the permanent magnet is less widely spaced than the respective base surface of the membrane.
  • Non-developable funnel-shaped or spherical cap-shaped membranes are particularly stiff and thus allow a full-surface and uniform movement of the membrane.
  • a cone-shaped membrane is possible.
  • the diaphragm stop has the form of a shell of a rotationally symmetrical body.
  • the rotationally symmetrical body has between a base surface and a top surface one Extension in the axial direction.
  • the base has an extension in the radial direction, which is greater than the extension of the top surface in the axial direction.
  • the rotationally symmetrical body, whose lateral surface is formed by the membrane is oriented so that the base of the rotationally symmetrical body is spaced from the permanent magnet in the axial direction further than the top surface of the rotationally symmetrical body.
  • the particular airtight membrane is connected to the loudspeaker frame via a particularly airtight bead.
  • the sound generator further comprises a housing on which the loudspeaker frame is mounted.
  • the housing has a connection opening for the fluid connection of an intake system or exhaust system.
  • connection of the loudspeaker basket with the membrane attached to it on the housing is airtight.
  • this connection with the housing takes place indirectly via a bell-mouth attached airtight to the housing.
  • the membrane divides an inner volume of the housing into a part separated from the exhaust system or intake system and a part in fluid communication with the exhaust system or intake system via the connection opening.
  • the membrane and possibly an edge of the speaker basket are located in the part of the housing, which part is in fluid communication with the exhaust system or intake system via the connection opening, only these elements are the hot and loaded with corrosive chemicals exhaust gas or possibly exposed to moist and / or polluted with polluted air sucked.
  • these elements may be formed of a material which can withstand the exhaust gas and any condensate or the moisture and pollutants of the intake air.
  • the other elements of the sound generator and in particular the sensitive voice coil which is exposed due to ohmic losses anyway a certain temperature load, however, are shielded by the membrane and the inner wall of the housing of the exhaust gas or the sucked air. As a result, the risk of a short circuit of the voice coil is reduced by resulting condensate of the exhaust gas or humidity of the intake air.
  • the housing is airtight except for the connection opening.
  • the loudspeaker basket further carries a centering device, which is connected to the voice coil former or in the region of the voice coil carrier with the membrane.
  • the centering device ensures the return of the membrane to the rest position and the centering of the voice coil relative to the permanent magnet.
  • the loudspeaker basket is made of metal or plastic.
  • the housing of the sound generator is formed of metal or plastic.
  • the housing of the sound generator is formed from two cup-shaped shells, which are soldered, welded, crimped, riveted, glued or screwed together airtight.
  • the membrane is made of metal and in particular of aluminum or titanium or of plastic and in particular of aromatic polyamides.
  • the permanent magnet has rare earths and in particular neodymium and is in particular formed from a neodymium-iron-boron alloy.
  • Embodiments of an anti-noise system for exhaust systems and / or intake systems of an internal combustion engine-operated vehicle have an anti-noise control and at least one sound generator as described above.
  • the voice coil of the at least one sound generator is electrically connected to the anti-ballast control.
  • the antisound controller is designed to generate at least one control signal and output to the voice coil of the at least one sound generator.
  • the control signal is suitable for at least partially and preferably completely extinguishing sound in the interior of the exhaust system or intake system when the voice coil of the at least one sound generator is operated with this control signal. This extinction can be done according to the amount and in the correct phase.
  • Embodiments of a motor vehicle include an internal combustion engine with an engine controller, an intake system and an exhaust system, which are in fluid communication with the internal combustion engine, as well as the antisound system described above.
  • the at least one sound generator of the anti-ballast system is in fluid communication with the intake system or exhaust system.
  • the antisound control of the antisound system is connected to the engine control of the internal combustion engine of the vehicle.
  • FIG. 3 1 is a schematic sectional view through the sound generator 103 according to an embodiment of the invention.
  • the sound generator 103 has a housing 131, which accommodates a voice coil loudspeaker 102 in its interior.
  • the speaker 102 has a permanent magnet 121 made of neodymium-iron-boron alloy and a cone-shaped membrane 122 made of plastic, which are commonly supported by a loudspeaker basket 123 made of sheet steel.
  • the cone-shaped membrane 122 is at its base radially outward on an elastic bead 127 made of plastic with the
  • Loudspeaker basket 123 connected.
  • the top surface of the cone-shaped membrane 122 is closed at the center by a cap 124.
  • a voice coil bobbin 125 which carries a voice coil 126, is attached to the diaphragm 122.
  • the voice coil 126 is disposed in a DC magnetic field generated by the permanent magnet 121.
  • the permanent magnet 121 has a corresponding recess.
  • the permanent magnet 121 can continue in FIG. 3 Having not shown pole plates.
  • the top surface of the cone-shaped membrane 122 with the cover cap 124 faces the loudspeaker frame 123 and the permanent magnet 121; the base surface of the conical membrane 122 faces away from the loudspeaker frame 123 and the permanent magnet 121.
  • the loudspeaker frame 123 is radially airtightly connected to an inner wall of the housing 131 of the sound generator 103, and is further connected to a horn 142.
  • the bell mouth 142 is connectable via a connection opening 132 of the sound generator 103 and a connecting pipe 141 with the intake system and / or exhaust system of a vehicle operated by internal combustion engine. Since the connection of the cap 124 to the membrane 122 and the connection of the membrane 122 via the bead 127 on the speaker basket 123 is airtight, the speaker 102 so divides the internal volume of the sound generator 103 into two hermetically separate parts.
  • the voice coil bobbin 125 with the voice coil 126 and the permanent magnet 121 through the membrane 122, the bead 127, the cap 124 and the loudspeaker frame 123 hermetically separated from the corrosive exhaust gas.
  • a membrane stopper 150 made of polycaprolactam (nylon 6) having a ball hardness in the dry state of 150 MPa according to DIN 53456, which is fixed to the loudspeaker frame 123.
  • polycaprolactam nylon 6
  • the present invention is not limited to the use of polycaprolactam having the above hardness.
  • a polycaprolactam having an elastic modulus in the bending test of 2,800 MPa or another plastic and in particular a hard rubber.
  • the diaphragm stop 150 has a multiplicity of projections 151 which are arranged around the permanent magnet 121 and each have a stop surface 152 facing the diaphragm 122.
  • the stop surfaces 152 of all projections 151 of the diaphragm stop 150 are spaced over their entire surface facing the diaphragm 122 by 5 mm. This distance corresponds to 2 percent of the maximum diameter of the diaphragm 122.
  • the diaphragm 122 comes into abutment simultaneously with the abutment surfaces 152 of all the projections 151, so that excessive vibration of the diaphragm 122 is prevented.
  • FIGS. 4A to 4D the in FIG. 3 used diaphragm stop 150 explained in more detail. It shows FIG. 4A a perspective side view, FIG. 4B a perspective view from above, FIG. 4C a perspective view obliquely from below and Figure 4D a perspective view obliquely from above on the diaphragm stop 150th
  • the diaphragm stop 150 has twenty-nine projections 151 which are distributed uniformly over an angular range of 360 ° and by injection molding are formed integrally with a first ring portion 153.
  • the first ring portion 153 serves to attach the diaphragm stop 150 to the loudspeaker frame 123.
  • the size of the abutment surfaces 152 of the projections 151 is shown in FIG Figures 3 and 4A-4D shown embodiment selected so that the abutment surfaces 152 of all projections 151 together have a surface which is 8 percent of the surface of the diaphragm 122.
  • the edges of the abutment surfaces 152 are rounded and have a radius of 0.5 mm in the illustrated embodiment.
  • the diaphragm stop 150 on the abutment surfaces 152 has a largest diameter corresponding to the largest diameter of the membrane 122.
  • the diaphragm stop 150 on the abutment surfaces 152 has a smallest diameter which is larger than the largest diameter of the cap 124 and the voice coil bobbin 125 underneath and in the in Figures 3, 4A-4D shown embodiment 60 percent of the largest diameter of the membrane 122 corresponds.
  • the abutment surfaces 152 formed on the projections 151 of the membrane stop 150 have an extent 8 times greater in the radial direction than in the circumferential direction.
  • FIGS. 5A to 5C an alternative membrane stop 150 'is described, which is alternative to that described in FIG. 3 shown membrane stop 150 can be used. It shows FIG. 5A a perspective side view, FIG. 5B a perspective view from above, FIG. 5C a perspective view obliquely from below on the diaphragm stop 150 '. Since this alternative diaphragm stop 150 'in the FIGS. 4A to 4D shown membrane stop 150 is very similar, will be discussed below only the differences and otherwise refer to the above statements.
  • the in the FIGS. 5A to 5C shown alternative diaphragm stop 150 ' has two integrally formed with the projections 151 second ring portions 154, 155.
  • These second ring sections 154, 155 have a material thickness of 4 mm and are arranged so that their surface facing the membrane 122 in the assembled state of the membrane stop 150 'is aligned with the abutment surfaces 152 of the projections 151.
  • the two second ring portions 154, 155 are arranged at the radial end portions of the abutment surfaces 152, thus ensuring that at these end portions in the event of abutment of the membrane 122 on the abutment surfaces 152 not to a selective loading of the membrane 122nd comes.
  • FIG. 6 There is shown schematically an antisound system 7 which uses the sound generator 103 described above.
  • a first sound generator 103 is connected in the region of an orifice 43 via a Y-piece 1 and a connecting pipe 141 to an exhaust system 4 of a vehicle. About the mouth 43 guided exhaust gas is discharged to the outside in the exhaust system 4.
  • a first error microphone 9 is provided in the form of a pressure sensor.
  • the error microphone 9 measures pressure fluctuations and thus sound inside the Y-piece 1 in a section downstream of a region in which the fluid connection between the exhaust system 9 and the sound generator 103 takes place. It is emphasized, however, that the error microphone 9 is only optional.
  • a second sound generator 103 'with a second loudspeaker 102' is connected to an intake system 10 of the vehicle. Upstream of a region in which the fluid connection between the intake system 10 and the sound generator 103 'takes place, a second error microphone 9' is arranged in the intake system 10. Again, it is emphasized that the error microphone 9 'is only optional.
  • the flow direction of the guided in the intake system 10 and the air guided in the exhaust system 4 exhaust gas is shown by arrows.
  • the loudspeakers 102, 102 'of the sound generators 103, 103' and the error microphones 9, 9 ' are electrically connected to an anti-noise controller 8. Further, the anti-noise controller 8 is connected via a CAN bus to a motor controller 61 of an internal combustion engine 6. It is emphasized that the present invention is not limited to a CAN bus.
  • the exhaust system 4 may further comprise at least one arranged between the engine 6 and the Y-piece 1 catalyst (not shown) for cleaning the emitted from the engine 6 and guided in the exhaust system 4 exhaust gas.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Exhaust Silencers (AREA)
EP14172712.3A 2013-07-17 2014-06-17 Générateur acoustique d'un système antibruit agissant sur les bruits de gaz d'échappement et/ou les bruits d'admission d'un véhicule automobile Active EP2826966B1 (fr)

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EP0373188A1 (fr) 1988-02-19 1990-06-20 Noise Cancellation Tech Dispositif de silencieux de gas d'echappement pour moteur a combustion interne.
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EP1515583A1 (fr) * 2003-03-31 2005-03-16 Matsushita Electric Industrial Co., Ltd. Haut-parleur
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Publication number Priority date Publication date Assignee Title
WO2018229371A1 (fr) 2017-06-14 2018-12-20 Psa Automobiles Sa Ligne d'echappement de gaz de combustion avec haut-parleur

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CN104295342B (zh) 2016-06-01
US20150020762A1 (en) 2015-01-22
US9066168B2 (en) 2015-06-23
JP5726356B2 (ja) 2015-05-27
DE102013011937B3 (de) 2014-10-09
CN104295342A (zh) 2015-01-21
JP2015042865A (ja) 2015-03-05
EP2826966B1 (fr) 2016-01-20

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